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提高聚氯乙烯混炼效果的行星辊式挤出机 总被引:1,自引:1,他引:0
聚氯乙烯(PVC)的混炼是加工过程中较重要的一个环节。为了增强混炼效果,提高制品质量,在混炼技术及混炼设备方面进行了一些改进,取得了一定的进步。本文主要介绍行星辊式挤出机对PVC塑料的混炼及其应用 相似文献
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行星辊轮挤出机是一种新混炼设备。本文着重介绍了行星段的结构、工作原理和混炼过程,以及挤出机的控制系统和应用领域。 相似文献
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本文着重讨论了单螺杆往复经式混炼挤出机的结构原理、运动分析和混炼原理,从理论上论证了这种机型的混炼效果及其优越性。 相似文献
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对单螺杆挤出机分散混炼机理进行了分析,并讨论了目前应用的分散混炼元件,解释了其缺乏有效混炼的原因,探讨了改善单螺杆挤出机分散性能的方法。 相似文献
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锥形双螺杆挤出机是塑料加工的一种重要机型。对SJSZ-55锥形双螺杆挤出机的螺杆进行了设计,研究结果可以指导同类螺杆的设计。 相似文献
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Compounding extruders are still designed based on experience and time‐consuming experimental examinations. This work investigates the morphology development of incompatible polyblends along a mixing zone at the end of a corotating twin‐screw extruder. During the process, the samples are taken from the running extruder using special barrel plates. These samples are subsequently examined by means of scanning electron microscopy (SEM). This method allows sampling in less than 1 min and thus extremely fast and almost unaffected. The experimental investigation of the morphology development improves the knowledge about the factors essentially influencing the blending process. It also allows the verification as well as improvement of theoretical models. Polyblends of polypropylene (PP) and polyamide (PA) with 7.5, 15, and 30 wt % PA were examined. As well as the relevance of the mass percentage of the dispersed phase, the influence of the screw geometry, the screw speed, the melt temperature, the melt throughput, and the pressure profile was investigated. Apart from the melt throughput, all varied factors show an influence on the resulting blend morphology that may not be neglected. However, the changes of the mean particle sizes in the observed mixing zones are only gradual (mean particle size ≈ 1–4 μm), which can be attributed to the extremely fine blend morphology already existing during or after the melting. That means that the application of “classic melting zones” generally already produces finely dispersed blend morphologies, thus proving the essential importance of the melting zones regarding the development of the blend morphology. Consequently, the mean particle sizes, calculated by means of quantitative image analyses of SEM micrographs in the mixing zones following the homogenizing section only slightly depend on the compounding conditions (screw speed, melt throughput, screw geometry, melt temperature, and pressure profile). However, the direct visual analysis of the SEM images, especially in the first parts of the mixing zones, shows the simultaneous existence of large PA6 particles in the PP matrix. In addition, a downstream unification of the particle size distribution can be observed. Especially the number and size of the coarser particles decreases in the mixing zones. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 76: 708–721, 2000 相似文献
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利用不同螺杆组合的双螺杆挤出机制备了超细碳酸钙填充聚丙烯试样,通过测量挤出机的功率来计算其能耗,并测试了试样的拉伸性能,研究了45°捏合盘厚度、塑化段捏合盘错列角、转子类螺纹元件位置及多组捏合盘连续排列形式对挤出机能耗和试样拉伸性能的影响。结果表明,45°捏合盘厚度为30 mm或45 mm、塑化段捏合盘错列角为30°或45°、转子类元件放在塑化混合段之后,均可在保持试样较高拉伸强度的条件下有效地降低挤出机能耗。多组捏合盘连续排列方式下的挤出机能耗并未大幅增加,可适用于需要高剪切物料的挤出生产。 相似文献
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通过利用ANSYS有限元软件对斜齿齿形盘和直齿齿形盘的流场进行模拟,得到流道的速度场、粘度场、压力场、剪切速率场和剪切应力场,并在此基础上对两种齿形盘不同螺杆构型的混合性能进行对比。 相似文献
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对双螺杆挤出机用于冻胶纺丝,其结构特性及相关设计多数进行了详细的分析和探讨,同时提出了一些参考建议,经特殊设计加工后的双螺杆挤出机应用在冻胶纺丝工艺上,成功地纺制出高强高模聚乙烯纤维。双螺杆挤出技术用于冻胶纺丝工艺已具备条件并切实可行。 相似文献
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介绍与德国专家共同研制开发的新型饲料加工同向平行双螺杆挤出机的配置及各部分结构特点,其中机头结构的设计具有独创性,成功地攻克了淀粉挤出困难的难题;挤压系统长径比只有16~20,螺杆组合也较特殊,与普通机型相比差别较大。并简要介绍了用该设备加工淀粉鱼饲料的加工工艺。 相似文献
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着重介绍日本新型双螺杆挤出机的最新研制和开发的机型,评述新型双螺杆挤出机的特点,特别是新近开发的SCR双螺杆挤出机、BIVOLAV双螺杆挤出机、HTM双螺杆挤出机、TEX双螺杆挤出机、高剪切型双螺杆挤出机、格子形叶的双螺杆挤出机、新AP型双螺杆挤出机的结构、性能及其应用,提出今后双螺杆挤出机发展前景及方向。 相似文献